2 Kings 21:18
And Manasseh slept with his fathers, and was buried in the garden of his own house, in the garden of Uzza: and Amon his son reigned in his stead. And Manasseh slept with his fathers, and was buried in the garden of his own house, in the garden of Uzza: and Amon his son reigned in his stead.
Manasseh died and was buried, and his son Amon took the throne in his place, marking the close of one reign and the opening of another in Judah. The burial was in the garden of his own house, in the garden of Uzza, and the succession passed directly from father to son. It was the death of a wicked king of Judah and his replacement by a son who was also wicked.
Manasseh had led the nation into heathenism and idolatry, and Amon continued that idolatrous course rather than turning from it. Yet in the account of Judah's kings Manasseh is described as wicked and at the same time as one who received God's mercy. This passing of power from one idolatrous ruler to another carried Judah further in following Israel's idolatry toward captivity.
That wicked succession from father to son stood immediately before the throne passed to the good reformer Josiah. It formed the corrupt religious and moral setting into which Josiah was born. The evil of Manasseh and Amon thus frames the background of Josiah's reforming reign.
The verse belongs to the history of Judah's remaining kingdom after the ten tribes had been swept away. It stands in the closing chapters of Kings that record the wicked and weak reigns of the kings of Judah. The books of Kings trace those reigns through to the Babylonian captivity.
This change of kings is one succession in the long sequence of the kings of Judah from Ahaziah to Jehoahaz and the kings of Israel from Joram to Hoshea covered in 2 Kings 7-23 across nearly 300 years.